Start or Teksavvy - who's speed quotes to believe?

TSI's postal code check says I'm only good for the 25/10 service while start says I'm good for the 50/10. Who's correct? Or does this mean that TSI doesn't offer the 50/10 service yet, where I'll be living?

Kinda similar situation. I have had VDSL2 before and I knew the maximum attainable was about 63-75 depending on what year I had the Bell service.

Bell's website says max 25/10, Teksavvy says 25/10...

Start says:Bell: cannot determine host 2

We have fibre to the building, I know because I saw it being installed... the phone wires may not support 75 meg but they could. I wouldn't want to install 25/10 and then have to pay $25 to get them to bump it up to 50/10 after the fact...